Basically, I have two classes that share a bunch of such internal functions (no object required, it's just string parsing)
Put the functions into a third, non-class module, export them, and use it in both your class modules.
Inheritance only works for methods, not plain ol' functions. And inheriting from a class that you've no intention of using inheritance--just so you can import some functions that live in the same file--leaves you open to all kinds of nasty surprises down the line.
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